package com.lgh.springframework.beans.factory.support;

import com.lgh.springframework.beans.BeansException;
import com.lgh.springframework.beans.factory.BeanFactory;
import com.lgh.springframework.beans.factory.config.BeanDefinition;

/**
 * ******************************************************
 *
 * @author liugh9
 * @version 1.0
 * @classname AbstractBeanFactory
 * @description 模板方法定义bean的获取
 * @date 2023/02/21 20:55
 * <p>
 * ******************************************************
 */
public abstract class AbstractBeanFactory extends DefaultSingletonBeanRegistry implements BeanFactory {

    @Override
    public Object getBean(String name) throws BeansException {
        return doGetBean(name, null);
    }

    @Override
    public Object getBean(String name, Object... args) throws BeansException {
        return doGetBean(name, args);
    }

    @Override
    public <T> T getBean(String name, Class<T> requiredType) throws BeansException {
        return (T) getBean(name);
    }

    protected <T> T doGetBean(final String name, final Object[] args) {
        Object bean = getSingleton(name);
        if (bean != null) {
            return (T) bean;
        }

        BeanDefinition beanDefinition = getBeanDefinition(name);
        return (T) createBean(name, beanDefinition, args);
    }

    /**
     * 创建bean对象
     * @param beanName
     * @param beanDefinition
     * @param args
     * @return
     * @throws BeansException
     */
    protected abstract Object createBean(String beanName, BeanDefinition beanDefinition, Object[] args) throws BeansException;


        /**
         * 获取bean定义对象
         * @param beanName
         * @return
         * @throws BeansException
         */
    protected abstract BeanDefinition getBeanDefinition(String beanName) throws BeansException;
}
